66186848465 has 4 divisors (see below), whose sum is σ = 79424218164. Its totient is φ = 52949478768.

The previous prime is 66186848411. The next prime is 66186848467. The reversal of 66186848465 is 56484868166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44744517841 + 21442330624 = 211529^2 + 146432^2 .

It is a cyclic number.

It is not a de Polignac number, because 66186848465 - 2⁶ = 66186848401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66186848398 and 66186848407.

It is not an unprimeable number, because it can be changed into a prime (66186848467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6618684842 + ... + 6618684851.

It is an arithmetic number, because the mean of its divisors is an integer number (19856054541).

Almost surely, 2^66186848465 is an apocalyptic number.

It is an amenable number.

66186848465 is a deficient number, since it is larger than the sum of its proper divisors (13237369699).

66186848465 is a wasteful number, since it uses less digits than its factorization.

66186848465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13237369698.

The product of its digits is 53084160, while the sum is 62.

The spelling of 66186848465 in words is "sixty-six billion, one hundred eighty-six million, eight hundred forty-eight thousand, four hundred sixty-five".